<template>
	<view>
		<my-search :radius="16" @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
				<block v-for="(cate,index) in cateList" :key="index">
					<view class="left-scroll-view-item" :class="[index === active ? 'active' : '']"
					@click="activeChanged(index)"
					>
					{{cate.cat_name}}
					</view>
				</block>
			
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTopo">
				<view class="cate-lv2" v-for="(item,index) in cateLevel2" :key="index">
					<view class="cate-lv2-title">/  {{item.cat_name}}</view>
					<!-- 三级分类的数据列表 -->
					<view class="cate-lv3-list">
						<!-- 三级分类Item项 -->
						<view class="cate-lv3-item" v-for="(item3,i3) in item.children" 
						:key="i3" @click="gotoGoodsList(item3)"
						>
							<!-- 三级分类的图片 -->
							<image :src="item3.cat_icon" mode=""></image>
							<!-- 三级分类的文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import tabbarBadge from '../../mixins/tabbar-badge';
	export default {
		mixins: [tabbarBadge],
		data() {
			return {
				//当前设备的可用高度
				wh: 0,
				//分类列表数据
				cateList: [],
				active: 0,
				//二级分类数据
				cateLevel2: [],
				//三级滚动条的位置
				scrollTopo: 0,
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync();
			this.wh = sysInfo.windowHeight - 50;
			
			//调用获取分类列表数据的方法
			this.getCateList();
		},
		methods: {
			async getCateList() {
				const {data:res} = await uni.$http.get('/api/public/v1/categories');
				if(res?.meta?.status !== 200) return uni.$showMsg();
				this.cateList = res.message;
				this.cateLevel2 = this.cateList[0]?.children ?? []
			},
			activeChanged(index) {
				if(index !== this.active) {
					this.active = index;
					this.scrollTopo = this.scrollTopo === 0 ? 1 : 0;
					this.cateLevel2 = this.cateList[index]?.children ?? []
				}
				return
			},
			//三级分类跳转
			gotoGoodsList(item) {
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			//点击搜索跳转搜索页面
			gotoSearch() {
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container {
	display:flex;
	
	.left-scroll-view {
		width: 120px;
		
		.left-scroll-view-item {
			background-color: #F7F7F7;
			line-height: 50px;
			text-align: center;
			font-size: 12px;
			
			&.active {
				background-color: #FFFFFF;
				position: relative;
				
				&::before {
					content: ' ';
					display: block;
					width: 3px;
					height: 30px;
					position: absolute;
					top: 50%;
					left: 0;
					transform: translateY(-50%);
					background-color: #C00000;
				}
			}
		}
	}
	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}
	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;
		
		.cate-lv3-item {
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;
			
			image {
				width: 60px;
				height:60px;
				border: none;
			}
			
			text {
				font-size: 12px;
			}
		}
	}
	
}

</style>
